"Hillary Clinton has announced that she is letting her husband out to campaign but HE'S DEMONSTRATED A PENCHANT FOR SEXISM, so inappropriate!" Donald Trump tweeted Saturday

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Donald Trump has a new target.

The GOP front-runner is taking aim at Bill Clinton‘s “penchant for sexism” and history of marital infidelity as the former president joins wife Hillary Clinton on the campaign trail.

“Hillary Clinton has announced that she is letting her husband out to campaign but HE’S DEMONSTRATED A PENCHANT FOR SEXISM, so inappropriate!” Trump tweeted on Saturday.

The billionaire businessman borrowed the line from Hillary herself, who accused him of having a “penchant for sexism” after he said the former secretary of state and Democratic presidential front-runner “got schlonged by President Barack Obama in the 2008 election.

Trump criticized the Clintons again on Sunday in an interview with Fox News, accusing Hillary of “playing the woman’s card” and saying Bill was “fair game because his presidency was really considered to be very troubled because of all the things that she’s talking to me about.”

The attack continued on Monday morning, with Trump tweeting, “If Hillary thinks she can unleash her husband, with his terrible record of women abuse, while playing the women’s card on me, she’s wrong!”

Hillary condemned Trump last week for using the term “schlonged” – derived from a vulgar Yiddish word for penis – in reference to her 2008 loss to Obama.

“I really deplore the tone of his campaign, the inflammatory rhetoric that he is using to divide people, and his going after groups of people with hateful, incendiary rhetoric,” she told the Des Moines Register.

“It’s not the first time he’s demonstrated a penchant for sexism,” she added. “Again, I’m not sure anybody’s surprised that he keeps pushing the envelope.”

The real estate mogul warned Hillary of his forthcoming onslaught on Wednesday night, when he tweeted, “Hillary, when you complain about ‘a penchant for sexism,’ who are you referring to. I have great respect for women. BE CAREFUL!”

Meanwhile, the two presidential rivals were named winners in another contest – a Gallup survey of Americans’ most admired men and women in the world in 2015. Hillary and Obama were named the most admired woman and man, while Trump tied for second place – with Pope Francis.